Tool attachment



VW. E. BERGER TooL ATTACHMENT Jan'. 8, 1946.

Filed Aug. 8, 1942 2 Sheets-Sheet 1 171,72 l vv .Z2 Q/ ATTORNEYS Jan. 8 1946. l w. E. BERGER 2,392,571

A l TooL| ATTACHMENT v 'Filed Aug; s, 1942 2 sheets-sheet 2 ATTORNEYS I at one end and a tool carriage I2 mounted on the bed of the lathe for movement therealong by the 'feed screw |2a.

Mounted on the tool carriage is the cutting tool I3. The live spindle of the headstock, which is usually hollow, is provided with a chuck I4 from which projects the work I5. v

In the Yillustrated lathe, a manualV drawbarl mechanism I6 extending from the end of the Yheadstock projects through the spindle to operate the jaws of the chuck in the well known manner.

The drawbar is hollow so that work can be fedl l therethrough or can be inserted from the right into th'e chuck, and, upon manipulation of the handle |612, it is locked therein.

The attachment of the present invention has` as one of its features the accurate locating of the work in the chuck. As will be apparent in mass production, particularly of small pieces, the -f speedy and proper positioning ofthe work in the chuck so that it projectsV the proper distance therefrom is of vital importance.

This is accomplished by the attachment of the present invention which comprises an arm 20 having a work-engaging member 2| thereon pro@- vided with a flat end 2 la against which th'e work abuts.v 'Ihis work-engaging member, in the illus:-y

trated form of the invention, extends through the arm and is clamped in position thereon by a pair of `clamping nuts 22, although it may be adjustably mounted on the arm by other similar means.

This provides for adjustment of the projection 'Y of the member from the arm as may be required.

While the arm may be mounted on the lathe in many ways, in the preferred form of the invention a base or saddle 23 is provided which is of such length that it extends a'substantial distance across the bed of the lathe. Adjacent one end of the base is an upstanding post 24 having a split end 25 forming prongs 26 between which the arm 20 is pivotally mounted byA a screw 21 which extends through one prong and an aperv ture 20min the arm and is threaded in the other prong. Y

As is shown in Fig. 2, the bed is provided with three V-'shaped ways |0a, I0b and |0c and a fiat way |0d. The tool carriage slides on the outer wayslla, .|0b.` The base Y23 rests on the way |0d and is providedwith a V-shaped notchv chuck, the attachment of the present invention,

when employing a mounting means as herein illustrated,v forms a stop for limiting the tool carriage iny itsmovement away from the headstock. While the base itself would be sufficient to provide this stop, itis preferred to have a stop member 3|threaded in the base to extend transversely thereof and project from the opposite faces so that the end 32 may be adjusted to vary the point at which the tool carriage engagesit.

A lock nut 33 threaded on the stop member holds it in this position.

By properly positioning the stop member 3|, the movement of the carriage with respect to the end of the workpiece canberegulated as required, and if used with the usual-micrometer stop 34 of the lathe, which limits themovement I of the carriage toward theheadst-ock, accurate undercutting can be carried out*l in a simple and expeditious manner.

.When workpieces of sucha length support at their free ends are employed, the at-l tachment of the present invention will be locatedy on the bed to properly position the Work'inlthe chuck. After the work has been accurately positioned in the chuck by the attachment, the work-Y engaging member is thrown into inoperative posi- 28 whichextends over the way |0c and properly positions the base on the bed. The base is clamped into clamping relation by draft means 30. "When the attachment is secured to the base, the arm is swung about the pivot into vits operative position, 'as shown in full lines thereon in in a preselected position on the bed by a clamping Y `member- 29 disposed under the bed and drawn Fig. 2, and located therein by the engagement of the `portion 20h of th'e bottom of the arm' 20 With the bottom of the slot. In this position, the work-engaging member 2| is in line with Vthe axis.

of the spindle vso that it always is in position to engage and locate work disposed in the 'chuck at the end of the spindle. After the work has been locatedin'the chuck, the armmay be thrown into an inoperative position-in which it is out ofthe way of the operator andthe cutting tool. This is shown in the dot-and-dash' linesin'Fig. 2and 1s held in this position by the curved portion 20c engaging' the bottom ofthe slot. Y

From the'foregoingit will be seen' that rI have provided an efficient work-positioning means.` In

settingr up a jobithe base is clamped tothe bed and rthe member 2| adjusted in the arm so that tionand the tailstock center 35, which may-be freely rotatably mounted, if desired, run-.up to' support the free end of the accurately placed workpiece during the working operations on the'v workpiece as shown in Fig. 5. This preventsum due strain and pressure on the work-engagingl member, which would be applied thereto if'itwas used to support the free end of the work during this operation and might readily change theadjustment of the member and alterv the location of the succeeding workpieces.

The head of the stop member 3| may be utilized,

too, as a stop for engaging the pedestal ofthe" tailstock to limit the same whenl moved toward the work. This is especially desirous if the work is to be operated upon by a tool carried by'the tailstock, and more particularly with thel tailstock attachment of the type disclosed in copending application Serial No. 423,491, for'th'e attachment of the present lnvention'is positioned on the bed of the lathe to properly denne the projection of the work from the chuck and the'head of the stop member 3| acts to denne the position of the tailstock with respect to the end' of the work so positioned that operations by' tools cari ried .by the tailstock can be accurately carried out. In 'some' cases, it lmay be desired to Vcarry out y a series of operations on a single'piece, whichVVV would require the positioning of the work at 'dif-ir-VV ferent distances from the end of the chuck. In

order to accomplish this without having to shift f .the attachment on the bed'of the lathe or vary the projection of the member 2|, the form of .the

invention shown in Figs. 6 and 7 is employed in which the arm |20 is substituted on the base 'forV the arm 20. The arm |20 has a boss |20a'at the as require 2i' Aniattaohmentfonuseewitlrwailatheehaf/m. aeworkrlmlding Mchuck cemprismgraabasover-l lyirrgethe '.Lbedraotx'the. lati-ree awlampin'gememberr disposedsbelow kthemed; draft/means forvdi'awe4 ingetheebasefand clamping fmemberfintovclampef rigrrelatiomzwitmsadcbed; a: bess extendingeupe r Wardiycadj acenti one@ end; of thee base x an arm-z pivotally mounted imsaid'f boss;for'-'movemen:ti transverselyyof thee bedf; aapluralityzfof workio.; engaging. membersfeadiusta'bly.carriedby andtaseleot-ivelyfmovableintoe operative, position;c forshodihglthen,workfengagng; -memberse im. selected: iwsition;` and: means: for; limitinge movementrotisaidnarm in a position infwhichzthee Workmengaginga-member :im operativefpcsitioxnis;` inn lineewith; theecenter; or l theelathes chuckrto: lmtttheupiojeoton or: ,the Work-therefromii mAneattaehmentforyuseewitha latheteorical prising @supporting fmemberrfmountedirformoveefronmthegfaceffthereot to-:engagefwithvrecessesfgl 21 s 20:1 mentgtransterselygottheflatheg@ means adiustablyi-L formed omtbeediskfim nredeterminedarelation tof: seist;Wotkeeneagingemcmbersi; The;` end@ of fthe? sotlnetfJ enga-ges lfthe@base f I 2 mgotthe: pin l l 25;;tof1 limitftheeprojoctioneo:theffpin.; A'sspringi i285 normailyrcarriedzfji v Y. normailrryieldinelyrheldsgtherrind 2 5 irrzproiectedz positiomtoeengageathe rreoesses. Theftensionv; ot thea-spring cam b'euvarir-:dy byfrad-nustingna plug. 2 9 imthebpenfendrot thefsooketu.

When it is desired, for example, to providecafz series oa-.annular groovesfonraeworkpieeeg;the stop meanseon ftheebaseiseadjustednto denne-e theatre-i quired nnovenr-xentl oftA the '.carriage Theh Workengaeirplggmembets areaishensadjustedl teA project.

secured-fontheiflatheeforfmountingfsaidfmemberf: thereon;anpluralityyot;werkten-gag ggmernberse adiustablydcerriedebyythesupportinggmemberiand selectively@ moyab'le,intozioperativeepositionrwitm |26?imthatboss?respect thereto; and means forflimitinggmovef ment ot,a Seide-supporting member .f to locate" the work-engagingmember :impositionltdeneagethee workiirtrthefflathe Fandili-mit.- the projection; ori

theworkthereinf.. Y o 30;; 4mAngattaehmentforiuseewith aNlathoi-havinggj aiworlc holdingt,` chuckacomprising;aibase to-tbef; adjustablyisecuredtoftheilathea an@arm,pivotallyfy mountedn said baseefon movement transversely.; ot. the-lat.he a `memberl mounted.. onetime:I arms. .Y for.. movement t withI respect-thereto and.. havingg from'l-.the diskthe frequireddistanceftolocatefthe@ e workvin-:af-Serries of-nostons whichy will placezthe, portions off. theeworlnto be f'groovedain'theirange s oft movementioffi the `:tookcarriage Aften each; cutiismadeythe diskL is.-rotated tofbringgthe'nextu;

workvengagingg memberrinto position-rA and thewioif mnfvof Sadmmill Bap Workpieceaieagainflocatedethereby;andl theperae. i tipnfrepeated assrrequiredrf;

The-arm |2D-isfmovab1efto and-heldin operative-f andelinopeeativeeposition*rin tthef.:imam-ieri4 similar-. totthe iarm 2 irse-thatlthe-fworkfengaging rriernloers :anrbeev positionedr tot 1lciczatestlieworks and l, then swung outioithe-.wvay o-tethe operatorend tool-.2,

Win-lethegdisk-and bosshaveibeen shown,herein--` as *,beingfloeatedon-thegsidefof .the'farm away-,from i therheadstock, ittisgto beunderstood.tnat theyu mayI` betdisposed :on.thegotherfsidefsa-as to :haves theeworkqengagingemembersfin closetproximityfr to ,therohuck:1A

Variations.-1 a1 :id.,-` modifcationsi may,l bel made: Withinethe scope-eef thisfinvention andporticns,- of ctt,lewimrnze.verk-ments may,be@used(without others.,

I claim: 'j

1. ,Andattachrnentfforiuse with a lathe having a Work holding chuck comprising a fbase overlying the bed of the lathe; a clamping member disposed below the bed; draft means for drawing the base and clamping member into clamping relation with said bed; a Iboss extending upwardly adjacent one end of the base; an arm pivotally mounted in said boss for movement transversely of the bed; a work-engaging member adjustably carried by the arm; means for limiting movement of said arm in a position in which the workengaging member is in line with the center of the lathe chuck to limit the projection of the Work therefrom; and means extending transversely of the base and projecting from the sides thereof to form stop means for engaging the tool carriage or tailstock pedestal to limit movement thereof.

a..p1uralityfof fworkgengaging Imembers adjustablyg carrieddherebyfto uproject etherefrom.andselec? tivelyy movable. tintoioperatii/eipositicn. with.` rep; spectre .said arm; andmeansvforflimitingimore@ psition in which the work engaging memberfin operatire position is fin .line-ff Withjithe center, of@thealathe;r chucki to limit-.the e proiectionnofithe Work therefromf each- .ofethee Wiorlcaengagingg members being adjusted to.-A eX:` ;-,tend a diiferenttamount wherebylthe projectionf;

of workpieces..A fromf the. chuckmay`` be. varied withoutimovement of..the besef 5;`.Arr attachment for.use. ,witha lathe having aa work holding, chuckM comprisingx abase to..be.1 5m adiiistaloly., securedtoM the -Jaime; an arm. ,pivote any., mounted on base ,fonmovement A,transeverselyh.. of the bedey said; ,arm.,having am offset ;.v adisik;mounted ;for.rotationon.said=offset; v,afplu-f ralityof, Merli-engaging ,members adJ'ustably/.carf y ;L ried bythejdisk" and Vselectively,movable by; rota:

tionyof said '.'disk` into -operative .ppsitionwith rer spect to said.v ar1i1,thfe offset'. permitting? movement "of *the work-engaging. vmembers -`to ,said lop;r erativenposition Without interference by said'arm; and means for limiting movement of said arm in a position in which the work-engaging member in operative position is in line with the center of the lathe chuck to limit the projection of the Work therefrom.

6. An attachment foruse with a lathe having a Work holding chuck comprising a base to be adjustably secured to the lathe; an arm pivotally mounted on said base for movement transversely of the lathe and having a laterallyprojecting boss at one end; a disk rotatably mounted on the end of the boss; a plurality of work-engaging members carried by the disk to project therefrom, the Work-engaging members being adjstable to vary the -projection thereof and selectively movable into operative position with respect to the arm by rotation of said disk; a detent carried by the boss and cooperating `with means on'the 'disk for holding the worlz-engaging.V member in selected position; .and means for limiting movement of said arm in a position in which the work-engagingmember in operative position is in line with the center. of the lathe chuck to limit the projectionof the Work therefrom. i

'7.v In a lathe having a bed, a headstock provided with a chuck, and a'tool carriage movable over'the bed; an attachment therefor comprising a-base; meansfor securing the base to the bed l of the lathe beyondV the rtool carriage; a member mounted adjacent Vone end of the base for movement'transversely of the bed; a Work-engaging Y member Vadjustably carried thereby; means for limiting movement of said member in an operative'position in which the Vwork-engaging member is inline with the center of the lathe chuck to limit the projection of the work therefrom Yand invan inoperative position in which the member and Work-engaging member ldo not interfere with thel cutting operation;V and-means on the base for engaging the tool carriage and limiting outward movement thereof. V v 8. In a lathe having a bed,A a headstock providedwith a chuck, a tool carriage movable over the bedg andan adjustable stop for limiting move- Vment of the tool carriage in the direction toward the'chuck; an attachment comprising a base;

means'for Vadjustably securing the base to the bed-of the lathe beyond the tool carriage; an

` arm pivotally mounted adjacent one end of the base for movement transversely of the bed; a work-engaging member vadjustably carried ,thereby; means for limiting movement of said arm in an operative position in which the work-'engaging member is in line with the center of the lathe .chuck to limit the projection of the Work therefrom and in an linoperative position in which 1 the arm and Work-engaging member do not interfere with the cutting operation; and means Y, adjustably carried by the baseA for engaging the toolA carriage and limiting movement thereof in Y the direction away from saidchuck.

9. In a lathe having a bed, a headstock provided with a chuck and a tool carriage movable over the bed, an attachment comprising a base, means for securing the base to the bed of the lathe beyond the tool carriage, a supporting member mounted adjacent o ne end of the base for movement transversely of the bed, a plurality of work-engaging members adjustably carried by f the member for movement therewith and movable with respect thereto into an operative position thereon, means for limiting movement of said member in a position in which the operative Work-engaging member is in line with the center the lathe beyond the 'tool carriage, a memberv mounted on the base for movement transversely of the bed, means having" a plurality of workengag'ing members adjustably mounted therein to project therefrom secured to thefmember forY movement therewith and movable with respect thereto into an operative position thereon, means for limiting movement of'said Amember in a position in which the operative work-engaging member is in line with the center of the chuck to limit the projection of the Work therefrom and in another position in which the member and means mounted thereon do not interfere with the cutting operation, andmeans on the :base for engaging the carriage and limiting outward movement thereof, each of the work-engaging mem'- bers projecting a different amount whereby the location of Va workpiece in a chuck maybe varied without changing the limit of movement 'of the carriage.

11. In a lathe having vaA bed, a headstock pro 'Y vided with a chuck and a tool carriage movable over the bed; an attachment comprisinga base,

means for securing the `base tothe bed of the lathe beyond the tool carriage, a member mounted adjacent one end of the base for movement transversely of the bed, a disk'having a plurality ofV work-engaging members adjustably carried thereby to project Ifromy the face thereof, rmeans for rotatably mounting the disk on thev memberV with the face thereof toward said headstock, said disk moving with the arm and also with respect thereto to selectively place one of the Work-engaging members in an operative position thereon,

means for limiting movement" of said member in a position in which the operative Work-engaging memberl is in line with the center of the lathe chuck to limit the projection ofthe work therefrom and in another position in which the member and disk lcarried thereby do not interferez with the cutting operation, and means on the base for engaging the carriage and limiting movement thereof on the bed, the Work-engaging members projecting different amounts and locating workpieces in the chuck in different positions without changing the means for limiting movement of the carriage.

' VWALTER EL BERGER. 

